Improvement in lathe-chucks



einer site tzend fettine Letters Patent, No. 199,423, datedNovember 22, 1870.A

IMPROVEMENT IN LATHE-CHUCKS.

The Schedule referred to in these' Iletters Patent and making part of 'the same.

To all whom it may concern:

My present invention is au improvement on iny patent for lathe-chucks, granted April 25, 1865, and

.numbered 47,428, and consists of a certain new and improved arrangement of parts, all of which 4will be hereinafter more fully set forth.

In the drawing- Figure lis a perspective view of my invention, showing clamping device and beveled graduated slide or plate, and

Figure 2 is a central vertical longitudinal section of the same.

A is the shell;

B, a face secured thereto, and provided with grooves `cutat right angles to cach other.

In these grooves Lqor otherlshaped dogs or jaws C C slide. These dogs are provided with nuts c c, which vare secured therein by screw-caps or nuts, fitting ou shanks or projections making part of the nuts. Underneath the dogs, and within the shell, a mortise or recess is formed suiiieicntly large to allow a free movement ofthe dogs therein.

The dogs C are retained firmly in' place by nleaus of theV nuts lt, but when they are to be turned, said puts are loosened and the dogs are raised from their grooves in the face plate of the shell A. After turn# ing, the dogs the nuts are tightened, and the former rest in their grooves and remain immovable on the shanks ofthe nuts c, but their radialV movement is not interfered with.

Screws D, having squared'heads tting snugly in recesses fornied in the shell A, serve to adjust the dogs C, by passing through the nuts c c and engaging with their threaded interiors.` y

The dogs may be turned se as to present either of .their facesf g lt toward the center. Thus articles of irregular forni and varying thickness and width may be readily held. The shanks o't' the nuts crc are the fuierums of the dogs. y

In putting together the chuck, the nuts c are laid in the recesses, and the dogs fitted on the shanks of the nuts and rest in the grooves on the face of the chuck. The screws D are passed through the nuts, and thus the parts are held in place without the neccssity of dovetail, T-headcd, or other grooves.

A. suitable key is used to operate these screws, and when it is desired to place an article in the chuck the dogs are simply moved inwardly or outwardly, to suit the size ot' the article, the screws and n'uts holding the dogs firmly in place and preventing slipping-- The article may be larranged eccentrically or coneentrically, as may be required, the dogs being su constructed and located as to slide over the center of the shell, and also beyond its circumference, thus allowing of these adjustments.

0n the opposite face of the chuck a beveled groove is formed, to receive a graduated slide or plate, E.

This groove may be cut out directly from the shell,

or one side may he beveled andthe other left straight, Y

and a beveled piece set therein, and secured by screws, die. This form will be found the more advantageous, as it gives a tight joint and keeps the plate iirm in its place.

The plate Eis rendered adjustable by a screw, F, whose head or heads are secured in the plate at the ends of a mortise formed therein.

In this case the screw passes entirely through the plate. Instead, one ed or head may be squared, and the other rounded oli" and itted'in a notch or recess formed in the other end,.in which it may revolve as the plate is adjusted.

The plate E is provided with a threaded recess, G, by means of which ,it is secured to the lathe, and it is' attached to the shell by means or a nut, e, through which the screw F passes, the said nut being held stationary' by a screw, f, which is iixed in the chuck.

The nut being stationary, allows of the adjustment of the plate independently of the dogs and article held thereby, and the said adjustment should be equal to the quantity' it is desired to out off the article held by the dogs; and to render the cutting off oi' just the desired quantity certain, the plate is graduated as shown.

Having described ujy invention,

What I claim as new, and desire to secure by Let- .ters Patent, isf- The combination, as herein described, of the chuckshell A, screws D, threaded nut-bolts c, nuts k, and dogs C, for the purpose set forth.

To the above I have signed my name this 7th day of July, 1870.

WM. HASKELL KING.

Witnesses ABRAHAM MANNERS, OLIVER BRAKE. 

